Ice Gopher. Anthony Powell.
Sink holes in the ice shelf re-freeze over winter, and when the ice expands as it freezes it causes these mini-volcano shapes to appear. Ice expands at roughly a 9:1 ratio when it freezes, so there was roughly 9 times the volume of this wee eruption in liquid water hidden just below the surface of the ice a few weeks before.

Camera mounted to a post set in the ice for part of 5 month long time-lapse project. Recording changes in the sea ice pressure ridges in front of Scott Base in temperatures down to about -60C ambient. Despite the wrappings, snow was still driven inside the camera and packed solid in the compact flash and battery compartments.